Process of treating calcium carbid.



Fr es.

OLAF BOROH AND LAURITZ PETERSEN HVIID, OF

COPENHAGEN, DENMARK.

PROCESS OF TREATING CALCIUM CARBlD.

SPECIFICATION forming part of Letters Patent N 0. 670,607, dated March 26, 1901.

Application filed June 23,190Q- Serial No. 21,343- (No specimens.)

To all whom, it may concern.

Be it known that we, OLAF BORCH, manufactu rer and cand. pharm, of 18 Norregarde,

penhagen, in the Kingdom of Denmark, have invented a new and useful Process of Treata ing Calcium Oarbid; and we do hereby declare the nature of manner the same this invention and in what is to be performed to be particularly described and ascertained in and by the following statement.

This in vent-ion relates to a process for producing a mixture of carbid of calcium for illuminating purposes.

The employment in lamps and small apparatus of carbid of calcium on the drop orimmersion system has hitherto been attended with the great disadvantage that the lime sludge quickly assumes the form of a hard stone-like substance. This is attributed to a too-great generation of heat with a small supply of water. In consequence of the settling of the hardlime mass troublesome. Moreover, some time is occupied in relighting alamp, as the hard layer of lime which covers the undissolve'd carbid only allows the 'water to penetrate slowly.

In the specification of German Patent No. 94,639 a process is described where-by some containing sugar. protective coating is intended, on the one hand, to prevent the carbid from absorbing moisture, and, on the other hand, to *ender the lime produced soluble. The oarbi thus prepared certainly acts at The carbid is then acted upon by a s0- lution of saccharates of lime, whence insoluble multiple basic saccharates are produced, as the lime sludge is in excess relatively to the quantity of liquid acting on it Hence the opposite eifect'is produced to that desired. See Orgam'eche Ohemie Dr. V. vo'n Richter, 6th edition, 1891, pages 546-47.) The inner layers then become covered, as hitherto, with a hard siudge or layer of lime and insoluble placed by saccharates of lime, and thereby, on the one hand, promote the after-make of gas, and, on the other hand, which is still undissolved. This difficulty is obviated entirely by the present invention.

For ,the production of the carbid preparation a strongly-hygroscopic substance is empl0yed-namely, chlorid of calcium-the carbid not being coated therewith; but the said substance is well ground with the carbid in mills which are closed so as to be air-tight, so that a powder of chlorid of calcium and carbid thoroughly intermixed. This mixture is either packed in boxes or pressed into blocks (briquets) and wrapped in tin-foil or provided in some other manner with a protective If the preparation thus produced be employed for generating acetylene gas, the resulting lime sludge forms, on the one hand, a soft substance, and, on the other, has the importaut ad vantage ter is discontinued the after-make of gas quickly ceases, as the water contained in the chlorid-of-calci u m lime sludge is retained by the strongly-hygroscopic chlorid of calcium.

Moreover, the undissolved carbid of calcium 80 is coated with the moist chlorid-of-calcium that about ten per cent. of chlorid of cal- 90 cium be added to the carbid of The carbid of calcium can of 21 substance having fect-as, for example, nesium, or the like.

iaving now certained the nature of oursaid invention and in what manner the same is to beperformed, We declare that what we claim is l. The herein-described calcium.

a similar efchlorid of zinc, magcalcium carbid, which consists in grinding a suitable hygroscopic material therewith in an air-tight mill. 2. The herein-described process for treating prevent the Water from reach 55 is obtained which consists covering.

that when the supply of wacourse be reparticularly described and asprocess for treating 1c 7 calcium earbid, which consists in grinding 1.

suitable hygroscopic material therewith in an eirtight mill and then briqueting the same.

3. The herein-described process for treating calcium cerbid, which consists in grinding a.

- suitable hygroscopic material therewith in an air-tight mill, then briqueting the same,

-' and then providing the'hriquets with a. protective covering.

4. The herein-described process for treating calcium cerbid, which consists in grinding ten per cent. of asu'itztble hygroscopic materiel therewith in an-air-tight mill.

5. The-hereimdescri bed process of treating,

calcium oarbid, which consists in grinding ch lorid of ealcinmtherewith in an air-tight "mill andthen briqueting the same.

6. The -herein-described process of treating "2'9 c ztlciumcarbid, which consists in grinding quet consisting of calcium eel-bid and a suitable hygroscopic material.

In witness whereof we have hereunto set our hands in presence of two Witnesses.

OLAF BORCH. I LAURI'lZ PETERSEN IIVIll). \Vitnesses:

J. O. JACOBSEN, J. O. INGERSOLL. 

